server.use-ipv6 = "enable" will be inherited from global scope if set, so if that is not what is desired, add server.use-ipv6 = "disable" to appropriate $SERVER["socket"] blocks. Similar for server.set-v6only.

long-deprecated config directives will be removed. These directives are non-functional and emit a warning message if directives were renamed. After being removed, they will result in "directive unknown" warnings.